arch/powerpc/include/asm/kprobes.h

   1 #ifndef _ASM_POWERPC_KPROBES_H
   2 #define _ASM_POWERPC_KPROBES_H
   3
   4 #include <asm-generic/kprobes.h>
   5
   6 #ifdef __KERNEL__
   7 /*
   8  *  Kernel Probes (KProbes)
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  * Copyright (C) IBM Corporation, 2002, 2004
  25  *
  26  * 2002-Oct     Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
  27  *              Probes initial implementation ( includes suggestions from
  28  *              Rusty Russell).
  29  * 2004-Nov     Modified for PPC64 by Ananth N Mavinakayanahalli
  30  *              <ananth@in.ibm.com>
  31  */
  32 #include <linux/types.h>
  33 #include <linux/ptrace.h>
  34 #include <linux/percpu.h>
  35 #include <linux/module.h>
  36 #include <asm/probes.h>
  37 #include <asm/code-patching.h>
  38
  39 #ifdef CONFIG_KPROBES
  40 #define  __ARCH_WANT_KPROBES_INSN_SLOT
  41
  42 struct pt_regs;
  43 struct kprobe;
  44
  45 typedef ppc_opcode_t kprobe_opcode_t;
  46
  47 extern kprobe_opcode_t optinsn_slot;
  48
  49 /* Optinsn template address */
  50 extern kprobe_opcode_t optprobe_template_entry[];
  51 extern kprobe_opcode_t optprobe_template_op_address[];
  52 extern kprobe_opcode_t optprobe_template_call_handler[];
  53 extern kprobe_opcode_t optprobe_template_insn[];
  54 extern kprobe_opcode_t optprobe_template_call_emulate[];
  55 extern kprobe_opcode_t optprobe_template_ret[];
  56 extern kprobe_opcode_t optprobe_template_end[];
  57
  58 /* Fixed instruction size for powerpc */
  59 #define MAX_INSN_SIZE           1
  60 #define MAX_OPTIMIZED_LENGTH    sizeof(kprobe_opcode_t) /* 4 bytes */
  61 #define MAX_OPTINSN_SIZE        (optprobe_template_end - optprobe_template_entry)
  62 #define RELATIVEJUMP_SIZE       sizeof(kprobe_opcode_t) /* 4 bytes */
  63
  64 #define flush_insn_slot(p)      do { } while (0)
  65 #define kretprobe_blacklist_size 0
  66
  67 void kretprobe_trampoline(void);
  68 extern void arch_remove_kprobe(struct kprobe *p);
  69
  70 /* Architecture specific copy of original instruction */
  71 struct arch_specific_insn {
  72         /* copy of original instruction */
  73         kprobe_opcode_t *insn;
  74         /*
  75          * Set in kprobes code, initially to 0. If the instruction can be
  76          * eumulated, this is set to 1, if not, to -1.
  77          */
  78         int boostable;
  79 };
  80
  81 struct prev_kprobe {
  82         struct kprobe *kp;
  83         unsigned long status;
  84         unsigned long saved_msr;
  85 };
  86
  87 /* per-cpu kprobe control block */
  88 struct kprobe_ctlblk {
  89         unsigned long kprobe_status;
  90         unsigned long kprobe_saved_msr;
  91         struct pt_regs jprobe_saved_regs;
  92         struct prev_kprobe prev_kprobe;
  93 };
  94
  95 struct arch_optimized_insn {
  96         kprobe_opcode_t copied_insn[1];
  97         /* detour buffer */
  98         kprobe_opcode_t *insn;
  99 };
 100
 101 extern int kprobe_exceptions_notify(struct notifier_block *self,
 102                                         unsigned long val, void *data);
 103 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
 104 extern int kprobe_handler(struct pt_regs *regs);
 105 extern int kprobe_post_handler(struct pt_regs *regs);
 106 #ifdef CONFIG_KPROBES_ON_FTRACE
 107 extern int __is_active_jprobe(unsigned long addr);
 108 extern int skip_singlestep(struct kprobe *p, struct pt_regs *regs,
 109                            struct kprobe_ctlblk *kcb);
 110 #else
 111 static inline int skip_singlestep(struct kprobe *p, struct pt_regs *regs,
 112                                   struct kprobe_ctlblk *kcb)
 113 {
 114         return 0;
 115 }
 116 #endif
 117 #else
 118 static inline int kprobe_handler(struct pt_regs *regs) { return 0; }
 119 static inline int kprobe_post_handler(struct pt_regs *regs) { return 0; }
 120 #endif /* CONFIG_KPROBES */
 121 #endif /* __KERNEL__ */
 122 #endif  /* _ASM_POWERPC_KPROBES_H */